apps/rand.c

   1 /*
   2  * Copyright 1998-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include "apps.h"
  11
  12 #include <ctype.h>
  13 #include <stdio.h>
  14 #include <string.h>
  15
  16 #include <openssl/bio.h>
  17 #include <openssl/err.h>
  18 #include <openssl/rand.h>
  19
  20 typedef enum OPTION_choice {
  21     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  22     OPT_OUT, OPT_ENGINE, OPT_RAND, OPT_BASE64, OPT_HEX
  23 } OPTION_CHOICE;
  24
  25 OPTIONS rand_options[] = {
  26     {OPT_HELP_STR, 1, '-', "Usage: %s [flags] num\n"},
  27     {OPT_HELP_STR, 1, '-', "Valid options are:\n"},
  28     {"help", OPT_HELP, '-', "Display this summary"},
  29     {"out", OPT_OUT, '>', "Output file"},
  30     {"rand", OPT_RAND, 's',
  31      "Load the file(s) into the random number generator"},
  32     {"base64", OPT_BASE64, '-', "Base64 encode output"},
  33     {"hex", OPT_HEX, '-', "Hex encode output"},
  34 #ifndef OPENSSL_NO_ENGINE
  35     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
  36 #endif
  37     {NULL}
  38 };
  39
  40 int rand_main(int argc, char **argv)
  41 {
  42     BIO *out = NULL;
  43     char *inrand = NULL, *outfile = NULL, *prog;
  44     OPTION_CHOICE o;
  45     int format = FORMAT_BINARY, i, num = -1, r, ret = 1;
  46
  47     prog = opt_init(argc, argv, rand_options);
  48     while ((o = opt_next()) != OPT_EOF) {
  49         switch (o) {
  50         case OPT_EOF:
  51         case OPT_ERR:
  52  opthelp:
  53             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
  54             goto end;
  55         case OPT_HELP:
  56             opt_help(rand_options);
  57             ret = 0;
  58             goto end;
  59         case OPT_OUT:
  60             outfile = opt_arg();
  61             break;
  62         case OPT_ENGINE:
  63             (void)setup_engine(opt_arg(), 0);
  64             break;
  65         case OPT_RAND:
  66             inrand = opt_arg();
  67             break;
  68         case OPT_BASE64:
  69             format = FORMAT_BASE64;
  70             break;
  71         case OPT_HEX:
  72             format = FORMAT_TEXT;
  73             break;
  74         }
  75     }
  76     argc = opt_num_rest();
  77     argv = opt_rest();
  78
  79     if (argc != 1 || !opt_int(argv[0], &num) || num < 0)
  80         goto opthelp;
  81
  82     app_RAND_load_file(NULL, (inrand != NULL));
  83     if (inrand != NULL)
  84         BIO_printf(bio_err, "%ld semi-random bytes loaded\n",
  85                    app_RAND_load_files(inrand));
  86
  87     out = bio_open_default(outfile, 'w', format);
  88     if (out == NULL)
  89         goto end;
  90
  91     if (format == FORMAT_BASE64) {
  92         BIO *b64 = BIO_new(BIO_f_base64());
  93         if (b64 == NULL)
  94             goto end;
  95         out = BIO_push(b64, out);
  96     }
  97
  98     while (num > 0) {
  99         unsigned char buf[4096];
 100         int chunk;
 101
 102         chunk = num;
 103         if (chunk > (int)sizeof(buf))
 104             chunk = sizeof buf;
 105         r = RAND_bytes(buf, chunk);
 106         if (r <= 0)
 107             goto end;
 108         if (format != FORMAT_TEXT) {
 109             if (BIO_write(out, buf, chunk) != chunk)
 110                 goto end;
 111         } else {
 112             for (i = 0; i < chunk; i++)
 113                 if (BIO_printf(out, "%02x", buf[i]) != 2)
 114                     goto end;
 115         }
 116         num -= chunk;
 117     }
 118     if (format == FORMAT_TEXT)
 119         BIO_puts(out, "\n");
 120     if (BIO_flush(out) <= 0 || !app_RAND_write_file(NULL))
 121         goto end;
 122
 123     ret = 0;
 124
 125  end:
 126     if (ret != 0)
 127         ERR_print_errors(bio_err);
 128     BIO_free_all(out);
 129     return (ret);
 130 }